Download DU (University of Delhi) B-Tech 7th Semester Principles of Communication Engineering Question Paper

Instructions:

1. Immediately on receipt of the question paper, check to ensure that all the parts of the question paper Part I and Part II are present.
2. There are two parts.

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3. Part I has one question which is compulsory.
4. From Part II attempt any four out of six questions.

PART I

1. (a) Define modulation. What is the need for modulation? (6) FirstRanker.com

PART II

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2. (a) What are the advantages of SSB over DSBFC. Give the applications of SSB. (3)
3. (b) Calculate the percentage power saving when carrier and one of the side bands are suppressed in an AM wave modulated to a depth of 100%. (4)

3. (a) Derive expression of an FM wave, v(t) = 10cos(10⁶t+4sin10³t) (3)
4. (b) Draw the block diagram of a PCM system. (3)

4. (a) Compare PWM and PPM. (3)

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5. (b) For the following data draw the following line codes :
   1. (i) Bipolar NRZ
   2. (ii) Unipolar RZ
   3. (iii) Unipolar NRZ
   4. (vi) Manchester (4)

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5. (a) State the sampling theorem. (3)
6. (b) What are the advantages of digital modulation over analog modulation? (3)

6. (a) Find the value of reflection coefficient and VSWR for a transmission line.